Today, switching completely to Bitcoin is a very risky action for each state. the most important advantage of bitcoin over fiat funds is the speed of payments.
Are you serious? Bitcoin is not fast, and there are digital currencies online that is faster than bitcoin, so I would not call it as a strength of bitcoin.
Actually bitcoin as a payment system is not really that good, that's the reason why most bitcoin users are investors as well, it's decentralized that's why we like it but we can't gain massive adoption if there will be no support from a middle party or 3rd party that would make transaction faster.